1. Not personally familiar with something like that, but if MainAssist shows you in its FuBar tooltip, most FuBar tooltips can be detached from the panel and placed anywhere on your screen, leaving them open for you to see all the time.
2. ag_UF does not have Party Targets, though a new feature was implemented recently which allows you to create extra unit frames. See this thread (
http://www.wowace.com/forums/index.p...60.0;topicseen ) for a bit more info as well as a download to a mod someone wrote to make creating extra frames easier. Make sure you have the most recent versions of ag_UF (from
www.wowace.com/files ) and the unit creator mod which is attached to Sorata's posts in the thread I linked.
3. In your Party frame settings uncheck "Hide in raid"
4. I don't know anything really about XRS, but you could always grab one friend and convert your party to a raid to find out.